98 lines
2.1 KiB
Go
98 lines
2.1 KiB
Go
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package yaml
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import (
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"errors"
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"fmt"
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"sort"
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"strings"
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)
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// Volumes represents a list of service volumes in compose file.
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// It has several representation, hence this specific struct.
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type Volumes struct {
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Volumes []*Volume
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}
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// Volume represent a service volume
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type Volume struct {
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Source string `yaml:"-"`
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Destination string `yaml:"-"`
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AccessMode string `yaml:"-"`
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}
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// Generate a hash string to detect service volume config changes
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func (v *Volumes) HashString() string {
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if v == nil {
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return ""
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}
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result := []string{}
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for _, vol := range v.Volumes {
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result = append(result, vol.String())
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}
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sort.Strings(result)
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return strings.Join(result, ",")
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}
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// String implements the Stringer interface.
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func (v *Volume) String() string {
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var paths []string
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if v.Source != "" {
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paths = []string{v.Source, v.Destination}
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} else {
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paths = []string{v.Destination}
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}
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if v.AccessMode != "" {
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paths = append(paths, v.AccessMode)
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}
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return strings.Join(paths, ":")
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}
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// MarshalYAML implements the Marshaller interface.
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func (v Volumes) MarshalYAML() (interface{}, error) {
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vs := []string{}
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for _, volume := range v.Volumes {
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vs = append(vs, volume.String())
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}
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return vs, nil
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}
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// UnmarshalYAML implements the Unmarshaller interface.
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func (v *Volumes) UnmarshalYAML(unmarshal func(interface{}) error) error {
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var sliceType []interface{}
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if err := unmarshal(&sliceType); err == nil {
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v.Volumes = []*Volume{}
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for _, volume := range sliceType {
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name, ok := volume.(string)
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if !ok {
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return fmt.Errorf("Cannot unmarshal '%v' to type %T into a string value", name, name)
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}
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elts := strings.SplitN(name, ":", 3)
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var vol *Volume
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switch {
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case len(elts) == 1:
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vol = &Volume{
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Destination: elts[0],
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}
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case len(elts) == 2:
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vol = &Volume{
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Source: elts[0],
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Destination: elts[1],
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}
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case len(elts) == 3:
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vol = &Volume{
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Source: elts[0],
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Destination: elts[1],
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AccessMode: elts[2],
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}
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default:
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// FIXME
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return fmt.Errorf("")
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}
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v.Volumes = append(v.Volumes, vol)
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}
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return nil
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}
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return errors.New("Failed to unmarshal Volumes")
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}
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